UNIX BASH：从字符串中提取数 [英] UNIX BASH: extracting number from string

问题描述

这可能是一个很简单的问题，以有经验的人在UNIX但是我想从字符串中提取电话号码，并不断得到错误的结果。

This is probably a very simple question to an experienced person with UNIX however I'm trying to extract a number from a string and keep getting the wrong result.

这是字符串：

8962 ? 00:01:09 java

这它的输出我想要

8962

但由于某些原因，我不断收到完全相同的字符串返回。这是我试过

But for some reason I keep getting the same exact string back. This is what I've tried

pid=$(echo $str | sed "s/[^[0-9]{4}]//g")

如果有人可以帮助我走出这将是AP preciated。

If anybody could help me out it would be appreciated.

推荐答案

有对皮肤猫不止一种方法：

There is more than one way to skin a cat :

pti@pti-laptop:~$ echo 8962 ? 00:01:09 java | cut -d' ' -f1
8962
pti@pti-laptop:~$ echo 8962 ? 00:01:09 java | awk '{print $1}'
8962

切削减了基于一个分隔符不同领域的一条线或只是字节范围，并往往是这些任务非常有用。

cut cuts up a line in different fields based on a delimeter or just byte ranges and is often useful in these tasks.

AWK是一个较旧的编程语言用于一次操作的东西一行特别有用。

awk is an older programming language especially useful for doing stuff one line at a time.

这篇关于UNIX BASH：从字符串中提取数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！